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Which of the following compounds is primarily used as a disinfectant for water treatment and in the textile industry for bleaching?
Calcium Carbonate
Calcium Oxychloride
Sodium Chloride
Sodium Bicarbonate
Calcium Oxychloride
Calcium Oxychloride, commonly known as bleaching powder, is a pale yellowish powder used extensively for disinfecting drinking water and bleaching cotton and linen in the textile industry. It acts as an oxidizing agent, releasing chlorine gas which kills microorganisms and removes pigments from fabrics.
Calcium Oxychloride, commonly known as bleaching powder, is a pale yellowish powder used extensively for disinfecting drinking water and bleaching cotton and linen in the textile industry. It acts as an oxidizing agent, releasing chlorine gas which kills microorganisms and removes pigments from fabrics.
Think of it like a 'chemical eraser' that uses chlorine molecules to strip away dirt, germs, or unwanted color from surfaces and water supplies.
B-W-T (Bleaching, Water, Textile) тАФ Remember: Bleaching powder clears Water and Textiles.
CaOCl2тАЛ+H2тАЛOтЖТCa(OH)2тАЛ+Cl2тАЛ тАФ Reaction showing the release of chlorine
Cl2тАЛ+H2тАЛOтЖТHCl+HOCl тАФ Formation of hypochlorous acid (disinfectant)
When exposed to the atmosphere or mixed with water, Calcium Oxychloride reacts to release nascent oxygen or free chlorine. This chlorine gas acts as a powerful bleaching and oxidizing agent, disrupting the metabolic processes of bacteria or breaking the chemical bonds of chromophores (color-causing molecules) in fibers.
Chemical name: Calcium Hypochlorite (main active constituent)
Chemical formula: CaOCl2тАЛ
It is produced by the action of chlorine gas on dry slaked lime Ca(OH)2тАЛ
Its efficiency is often measured by 'available chlorine' content.
Highly effective disinfectant against waterborne pathogens
Low cost and easy to transport in powder form
It has a strong, irritating smell of chlorine
Can be unstable and lose potency if stored in humid conditions
Municipal water treatment plants
Paper pulp bleaching industry
Disinfecting swimming pools
Removing stains from white clothes
Option A (Calcium Carbonate) is commonly known as limestone/chalk, used in construction.
Option C (Sodium Chloride) is common salt used in food preservation.
Option D (Sodium Bicarbonate) is baking soda used in cooking and antacids.
B is correct тАФ Calcium Oxychloride is the chemical compound utilized as bleaching powder for water purification and fabric whitening.
In exams, always look for the keyword 'bleaching agent'; if it's not bleaching powder, check for 'sodium hypochlorite' (NaOCl), which is the liquid form used for similar purposes.
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